Digital Up / Down Counter


Posted on Aug 15, 2012

This Circuit uses a CD40110BE, Up/Down Counter IC's. This IC is able to Source Each Segment with 25 mA, Giving a Very Nice Bright Display. The 7 Segment Displays MUST be a Common Cathode Type, as I have used here. All the UnMarked Resistors should be at least 680 Ohms for Up To 12 Volts Supply Voltage. For Higher Supply Voltages up to 18 volts or Reduced Currents, I would suggest Increasing these Values to 1500 Ohms. Or if you want `Reduced Power` and `Brightness`, Adjust the resistor values as appropriate. Basically the Approximate Current is Supply voltage Minus 2, Divided by the Resistor Value. The Schematic posted here Only shows the First, Second, Third and Last Stages. And This board is for a counter of up to 9999.


Digital Up / Down Counter
Click here to download the full size of the above Circuit.

However: Since All Stages between the Third and Last, Would be the same, So you could make a display with as many digits as you wish, by expanding the circuit board. Additionally: You can just put in 1, 2, 3, or all 4 IC's and the Appropriate Displays. Other Options: 1) Adding a Clock Circuit with a Frequency of 1 Hz in place of the Reset Switch will create a Frequency counter in Hz/Sec. 2) Adding a Clock Circuit with a Frequency of 1 Hz into one of the Inputs can create an up or down counter type of timer. 3) Although Not Highly Accurate, a Simple 555 circuit will work as a Simple Clock.




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